The
epidemiological background on tick-borne [vernal] encephalitis in Novosibirsk area differs
by stress level. It causes an urgency of this problem researches.

Now
it is proved, that the natural locations of those or other infections do not
represent a continuous areal within the limits of the
same landscapes, and are dispersed round it mosaically.
It is explained by various assemblages of natural factors which in one case salutarily influence on activity of natural infections
virus carriers and their circulation in the nature, and in other caseoppressing or
negative influence.

Proceeding
from peculiarities of mapping object, there are also peculiarities of natural
hot-spot mapping. As the existence of natural hot-spot diseases is caused by a
complex of geographical factors the compiling principles and methods of
geographical environment complex map-making are assumed in a basis of work on
maps.

The
majority of researches were spent till now without taking into account the
complex characteristic of territory concerning natural
hot-spot diseases. Installation of studying was not the territory,
but the disease in connection with extending and structure of its locations.

Studying
natural factors, epidemiologists have established that a presence of forest land
percentage, the certain landforms and matching air moisture is necessary for a
carrier of a tick-borne [vernal] encephalitis virus. Such species of a wood as
a spruce, a fir, and a cedar in a combination with the higher air moisture are
optimal. Northern slopes of heights and the decomposed forms are optimal in a
landform relief features. The joint combination of these natural factors in one
territory creates favorable conditions for formation of the of the tick-borne
[vernal] encephalitis exciter locations.

Use
of the given theoretical development has been allowed making a row of maps of
the locations for tick-borne [vernal] encephalitis extending in Novosibirsk area.

The
basic demands shown to these maps are their efficiency and reliability. It is
necessary for perfection of organizational provisions on conducting preventive
ant epidemic measures.

Providing
of these demands is attained by application of GIS - technologies.

For
a map which in a due measure would meet practical demands of
sanitary-and-epidemiologic service and could serve as authentic enough
information source about the nucleation sites of tick-borne [vernal]
encephalitis. The scale of 1:200 000 which provides necessary detail of the
image is chosenThe
region Toguchinsky of the Novosibirsk oblast, being by one of the most
unsuccessful on tick-borne [vernal] encephalitis disease is chosen as
investigated territory.

In
a basis of a map the method of geographical environment interconnecting
separate elements on one base is assumed. Three auxiliary maps were vectored(Map of a
landform, map of climatic zones and map of a wood) for this purpose on a map
of Toguchinsky region).

The
electronic map of natural factors assemblage, containing every possible combinations of a landform, climate, vegetation was gained
as an interconnecting result and the analysis.

Application
of overlay operation allows automatically forming the formed polygones and according to the developed qualifier to gate
out the zones matching different extent of danger on a infection risk by
tick-borne [vernal] encephalitis: dangerous, less dangerous, unsafe, and
harmless.